Effects of soil moisture on physiological characteristics and the dynamic state of factors causing photosynthesis decline in potted tomato leaves in green house

With potted tomato plants in green house as material,the effects of soil moisture on physiological characteristics,leaf water potential (LWP),cell sap concentration (CSC),stomatal conductance (Gs),stomatal limitation value (Ls),and the dynamic state of photosynthesis decline factors were studied.The results showed that with the soil water stress increasing,the net photosynthetic rate (Pn),transpiration rate (Tr),and LWP reduced obviously,the Gs had the same trend,but the CSC raised.The diurnal variation curves of Pn and Tr of water stress and high water treatments were demonstrated in two peaks,but which was demonstrated in one peak under suitable soil moisture content.Along with the soil moisture content increasing,the time that non-stomatal limitation of photosynthesis appeared got the hysteresis.In the article,the more discussion was made on the key point dynamic state of non-stomatal limitation appeared.